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Denim is a sturdy cotton twill textile in which the weft passes under two or more warp threads. This twill weaving produces the familiar diagonal ribbing of the denim that distinguishes it from cotton duck.
It is a characteristic of any indigo denim that only the warp threads are dyed, whereas the weft threads remain plain white. As a result of the warp-faced twill weaving, one side of the textile then shows the blue warp threads and the other side shows the white weft threads. This is why blue jeans are white on the inside. This type of dyeing also creates denim's fading characteristics, which are unique compared to every other textile.
The word "denim" comes from the name of a fabric that was first made in the city of Nîmes, France, by the André family. It was originally called serge de Nîmes but the name was soon shortened to "denim."
Denim was traditionally colored blue with indigo dye to make blue jeans, although "jean" formerly denoted a different, lighter, cotton fabric. The contemporary use of the word "jean" comes from the French word for Genoa, Italy (Gênes), where the first denim trousers were made.
Dry or raw denim (contrasted with "washed denim") is denim that is not washed after having been dyed during production.
Over time, denim will usually fade, which is considered desirable by some people. During the process of wear, fading will usually occur on those parts of the article that receive the most stress. In a pair of jeans, these parts include the upper thighs, the ankles, and the areas behind the knees.
After being made into an article of clothing, most denim articles are washed to make them softer and to reduce or eliminate shrinkage (which could cause the article to not fit properly after its owner washes it). In addition to being washed, "washed denim" is sometimes artificially distressed to produce a "worn" look. Much of the appeal of artificially distressed denim is that it resembles dry denim which has faded. In jeans made from dry denim, such fading is affected by the body of the person who wears them and by the activities of his or her daily life. This process creates what many enthusiasts feel to be a more "natural" look than the look of artificially distressed denim.
To facilitate the natural distressing process, some wearers of dry denim will abstain from washing their jeans for more than six months.
Most dry denim is made with 100% cotton and comes from several different countries. In particular Japan, USA, and Zimbabwe are popular sources of denim. Some denimheads prefer the denim of one country to another for its durability, fades, and feel.
Dry denim also varies in weight. Some denim is considered "heavy" or thicker and others are "lighter" or thinner. Denim is weighed in terms of how much a yard of the denim fabric weighs in ounces. Simply put, heavier denim is much more rigid and resistant to wear.
Patterns of fading in jeans, caused by prolonged periods of wearing them without washing, have become the main allure of dry denim. Such patterns are a way of "personalizing" the garment.
These patterns have specific names:
Selvage is the edge of a fabric as it comes from the loom. Selvages are woven or knit so that they will not fray, ravel, or curl.
Selvage denim refers to a unique type of selvage that is made by means of using one continuous cross-yarn (the weft), which is passed back and forth through the vertical warp beams. This is traditionally finished at both edges with a contrasting warp (most commonly red); that is why this type of denim is sometimes referred to as "red selvage." This method of weaving the selvage is possible only when using a shuttle loom.
Shuttle looms weave a narrower 30-inch fabric, which is on average half the width of modern shuttleless Sulzer looms. Consequently a longer piece of fabric is required to make a pair of jeans from selvage denim (approximately three yards).
To maximize yield, most jeans are made from wide denim and have a straight outseam that utilizes the full width of the fabric, including the edges. Selvage denim has come to be associated with premium quality jeans, which show the finished edges from the loom rather than the overlocked edges that are shown on other jeans.
Denim was originally dyed with a dye produced from the plant Indigofera tinctoria, but most denim today is dyed with synthetic indigo dye. In both cases, the yarn undergoes a repeated sequence of dipping and oxidization — the more dips, the stronger the color of the indigo.
Rope dyeing is considered the best yarn-dyeing method, as it eliminates shading across the fabric width. The alternative "slasher process" is cheaper because only one beaming process is needed. In rope dyeing, beaming is done twice.
Denim fabric dyeing is divided into two categories: indigo dyeing and sulfur dyeing. Indigo dyeing produces the traditional blue color or shades similar to it. Sulfur dyeing produces specialty black colors and other colors, such as red, pink, purple, gray, rust, mustard, and green.
A mini-skirt made from purple denim
Only a small percentage (about 3%) of spandex is required within the fabric to create a significant stretching capacity of about 15%. However, this feature will shorten the wearing life of the garment.
Between 1973 and 1975 Volkswagen produced the Jeans Beetle, which had all-denim trim. They also repeated this concept in some later models. AMC offered a Levi's trim package for its Gremlin and Pacer models, which was actually spun nylon made to imitate denim. Jeep has also offered Levi's trim packages.
In 2007, the worldwide denim market equalled USD 51.6 billion, with demand growing by 5% and supply growing by 8% annually. Over 50% of denim is produced in Asia, most of it in China, India, and Bangladesh.
The following table shows where the world's denim mills are located.
|Region||No. of Denim Mills|
|Asia (excluding Pakistan & China)||104|
|Total Denim Mills (world-wide)||513|
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